diff --git a/pkgs/development/python-modules/charset-normalizer/default.nix b/pkgs/development/python-modules/charset-normalizer/default.nix
index e5df64dc15a8..577e1f3d105f 100644
--- a/pkgs/development/python-modules/charset-normalizer/default.nix
+++ b/pkgs/development/python-modules/charset-normalizer/default.nix
@@ -22,6 +22,11 @@ buildPythonPackage rec {
     hash = "sha256-MtSBKG8bXUsgEPyXxMRBPPFI8mfuIETy6UVshe7yqGg=";
   };
 
+  postPatch = ''
+    substituteInPlace _mypyc_hook/backend.py \
+      --replace-fail "mypy>=1.4.1,<=1.18.2" "mypy"
+  '';
+
   build-system = [
     setuptools
   ]